Synergistic CO ₂ Enrichment and Charge Separation in ZIF‐8/TiO ₂ Heterojunctions for Enhanced Photocatalytic CO ₂ Reduction

The rational design of heterostructured photocatalysts integrating efficient charge separation and CO 2 enrichment remains a key challenge in artificial photosynthesis. Herein, a ZIF‐8/TiO 2 heterojunction photocatalyst is reported, fabricated via gas‐phase deposition and hydrothermal methods. The composite combines ZIF‐8's high CO 2 adsorption capacity with TiO 2 's photocatalytic activity, forming a chemically bonded Type‐II interfacial heterojunction that promotes directional charge separation and suppresses carrier recombination. Synergy between ZIF‐8's porous CO 2 enriching framework and heterojunction‐driven charge transfer enhances CO 2 photoreduction performance: under simulated sunlight, it achieves CH 4 and CO evolution rates of 1.30 and 4.22 μmol g −1 h −1 , respectively. This work provides a scalable paradigm for integrating CO 2 capture with semiconductor heterointerfaces in photocatalytic systems.